I'm pretty dang sure it's like every other Toyota ECU in that you can't tune itToyota have the maps built into the microcontroller - they can't be changed.
There are 'modes' you can put the micro into to access external code, which is what the MINES & Blitz ECUs do but I haven't heard of them being made for 3RZ, and there is close to zero documentation on it
Your options really are piggy back, i.e. emanage, SAFC, etc or aftermaket ECU.
Cheers
Wilbo
Bookmarks